lama_byterun/tutorial/Values.lama

var samples = [
  {"a", "b", "c"},
  "string",
  [],
  Fruit ("apple"),
  fun () {skip}
];

fun show () {
  -- Note: it would be much better to use iterArray from standard unit Array;
  -- in that case, however, we wouldn't be able to showcase
  -- for-loops and []-expressions.
  for var i; i := 0, i < samples.length, i := i+1 do
    printf ("  %s has %d subvalue(s):\n", samples[i].string, samples[i].length);
    for var j; j := 0, j < samples[i].length, j := j+1 do
      printf ("    subvalue [%d] = %s\n", j, samples[i][j].string)
    od
  od
}

printf ("And now we look at accessing/modifying/analyzing the values.\n");
printf ("Any composite value can be asked on the number of its immediate subvalues,\n");
printf ("and these subvalues can be accessed:\n");

show ();

printf ("And the subvalues of a composite value can be reassigned.\n");

samples [2]    := [1, 2, 3];
samples [0][1] := {};

show ()